Analog Devices ADG3243 Datasheet

2.5 V/3.3 V, 2-Bit, Individual Control
Level Translator Bus Switch

ADG3243

FEATURES
225 ps Propagation Delay through the Switch

4.5 ⍀ Switch Connection between Ports
Data Rate 1.5 Gbps

2.5 V/3.3 V Supply Operation
Level Translation

3.3 V to 2.5 V

2.5 V to 1.8 V
Small Signal Bandwidth 710 MHz
8-Lead SOT-23 Package

APPLICATIONS

3.3 V to 2.5 V Voltage Translation

2.5 V to 1.8 V Voltage Translation
Bus Switching
Bus Isolation
Hot Swap
Hot Plug
Analog Switch Applications

GENERAL DESCRIPTION

The ADG3243 is a 2.5 V or 3.3 V, 2-bit, 2-port digital switch
with individual channel control. It is designed on a low voltage
CMOS process, which provides low power dissipation yet gives
high switching speed and very low on resistance. This allows the
inputs to be connected to the outputs without additional propa­gation delay or generating additional ground bounce noise.

The switches are enabled by means of the bus enable (BEx) input
signal. This digital switch allows a bidirectional signal to be
switched when ON. In the OFF condition, signal levels up to
the supplies are blocked.

This device is ideal for applications requiring level translation.
When operated from a 3.3 V supply, level translation from 3.3 V
inputs to 2.5 V outputs is allowed. Similarly, if the device is
operated from a 2.5 V supply and 2.5 V inputs are applied, the
device will translate the outputs to 1.8 V. This makes the device
suited to applications requiring level translation between different
supplies, such as converter to DSP/microcontroller interfacing.

FUNCTIONAL BLOCK DIAGRAM

A0

BE0

A1

BE1

PRODUCT HIGHLIGHTS

1. 3.3 V or 2.5 V supply operation.

2. Extremely low propagation delay through switch.

3. 4.5 Ω switches connect inputs to outputs.

4. Level/voltage translation.

5. Tiny SOT-23 package.

B0

B1

REV. 0

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ADG3243–SPECIFICATIONS

(VCC = 2.3 V to 3.6 V, GND = 0 V, all specifications T

1

unless otherwise noted.)

MIN

to T

MAX

,

B Version

Parameter Symbol Conditions Min Typ2Max Unit

DC ELECTRICAL CHARACTERISTICS

Input High Voltage V

Input Low Voltage V

Input Leakage Current I
OFF State Leakage Current I

INH

V

INH

INL

V

INL

I

OZ

ON State Leakage Current 0 ≤ A, B ≤ V
Maximum Pass Voltage V

P

VCC = 2.7 V to 3.6 V 2.0 V
VCC = 2.3 V to 2.7 V 1.7 V
VCC = 2.7 V to 3.6 V 0.8 V
VCC = 2.3 V to 2.7 V 0.7 V

± 0.01 ± 1 µA

0 ≤ A, B ≤ V

CC

CC

± 0.01 ± 1 µA
± 0.01 ± 1 µA

VA/VB = VCC = 3.3 V, IO = –5 µA 2.0 2.5 2.9 V
VA/VB = VCC = 2.5 V, IO= –5 µA 1.5 1.8 2.1 V

CAPACITANCE

3

A Port Off Capacitance CA OFF f = 1 MHz 3.5 pF
B Port Off Capacitance C
A, B Port On Capacitance C
Control Input Capacitance C

SWITCHING CHARACTERISTICS

Propagation Delay A to B or B to A, t
Propagation Delay Matching
Bus Enable Time BEx to A or B
Bus Disable Time BEx to A or B
Bus Enable Time BEx to A or B
Bus Disable Time BEx to A or B

3

5

6

6

6

6

Maximum Data Rate V
Channel Jitter V

OFF f = 1 MHz 3.5 pF

B

, CB ON f = 1 MHz 7 pF

PD

A

IN

4

t

, t

PHL

t

, t

PZH

t

, t

PHZ

t

, t

PZH

t

, t

PHZ

f = 1 MHz 4 pF

CL = 50 pF, VCC = 3 V 225 ps

PLH

VCC = 3.0 V to 3.6 V 1 3.2 4.6 ns

PZL

VCC = 3.0 V to 3.6 V 1 3 4 ns

PLZ

VCC = 2.3 V to 2.7 V 1 3 4 ns

PZL

VCC = 2.3 V to 2.7 V 1 2.5 3.4 ns

PLZ

= 3.3 V; VA/VB = 2 V 1.5 Gbps

CC

= 3.3 V; VA/VB = 2 V 45 ps p-p

CC

5ps

DIGITAL SWITCH

On Resistance R

ON

VCC = 3 V, VA = 0 V, IBA = 8 mA 4.5 8 Ω
VCC = 3 V, VA = 1.7 V, IBA = 8 mA 12 28 Ω

= 2.3 V, VA = 0 V, IBA = 8 mA 5 9 Ω

V

CC

= 2.3 V, VA = 1 V, IBA = 8 mA 9 18 Ω

V

On Resistance Matching ⌬R

ON

CC

VCC = 3 V, VA = 0 V, IA = 8 mA 0.1 0.5 Ω

POWER REQUIREMENTS

V

CC

Quiescent Power Supply Current I
Increase in ICC per Input

NOTES

1

Temperature range is as follows: B Version: –40°C to +85°C.

2

Typical values are at 25°C, unless otherwise stated.

3

Guaranteed by design, not subject to production test.

4

The digital switch contributes no propagation delay other than the RC delay of the typical RON of the switch and the load capacitance when driven by an ideal voltage
source. Since the time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay
of the digital switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.

5

Propagation delay matching between channels is calculated from the on resistance matching and load capacitance of 50 pF.

6

See Timing Measurement Information section.

7

This current applies to the control pin BEx only. The A and B ports contribute no significant ac or dc currents as they transition.

Specifications subject to change without notice.

7

⌬I

CC

CC

Digital Inputs = 0 V or V

CC

VCC = 3.6 V, BE0 = 3.0 V, BE1 = VCC or GND 0.15 8 µA

2.3 3.6 V

0.01 1 µA

REV. 0–2–

ADG3243

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

ADG3243

GND

A1

BE0

B0

BE1

V

CC

A0

B1

ABSOLUTE MAXIMUM RATINGS*

(TA = 25°C, unless otherwise noted.)

VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to +4.6 V

Digital Inputs to GND . . . . . . . . . . . . . . . . . –0.5 V to +4.6 V

DC Input Voltage . . . . . . . . . . . . . . . . . . . . . –0.5 V to +4.6 V

DC Output Current . . . . . . . . . . . . . . . . . 25 mA per Channel

Operating Temperature Range

Industrial (B Version) . . . . . . . . . . . . . . . . –40°C to +85°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 206°C/Ω

␪

JA

Lead Temperature, Soldering (10 sec) . . . . . . . . . . . . . 300°C

IR Reflow, Peak Temperature (<20 sec) . . . . . . . . . . . . 235°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability. Only one absolute
maximum rating may be applied at any one time.

PIN CONFIGURATION

8-Lead SOT-23

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Description

1 BE0 Bus Enable (Active Low)
2A0 Port A0, Input or Output
3A1 Port A1, Input or Output
4GND Ground Reference
5B1 Port B1, Input or Output
6B0 Port B0, Input or Output
7 BE1 Bus Enable (Active Low)
8VCCPositive Power Supply Voltage

Table I. Truth Table

BEx Function

LAx = Bx, 3.3 V to 2.5 V/2.5 V to 1.8 V Level Shifting
H Disconnect

ORDERING GUIDE

Model Temperature Range Package Description Package Branding

ADG3243BRJ-R2 –40°C to +85°CSOT-23 (Small Outline Transistor Package) RJ-8 SFA
ADG3243BRJ-REEL –40°C to +85°CSOT-23 (Small Outline Transistor Package) RJ-8 SFA
ADG3243BRJ-REEL7 –40°C to +85°CSOT-23 (Small Outline Transistor Package) RJ-8 SFA

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADG3243 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.

REV. 0

–3–

ADG3243

TERMINOLOGY

V

CC

Positive Power Supply Voltage.

GND Ground (0 V) Reference.

V

INH

V

INL

I

I

I

OZ

I

OL

V

P

Minimum Input Voltage for Logic 1.

Maximum Input Voltage for Logic 0.

Input Leakage Current at the Control Inputs.

OFF State Leakage Current. It is the maximum leakage current at the switch pin in the OFF state.

ON State Leakage Current. It is the maximum leakage current at the switch pin in the ON state.

Maximum Pass Voltage. The maximum pass voltage relates to the clamped output voltage of an NMOS device when
the switch input voltage is equal to the supply voltage.

R

ON

Ohmic Resistance Offered by a Switch in the ON State. It is measured at a given voltage by forcing a specified
amount of current through the switch.

⌬R

ON

OFF OFF Switch Capacitance.

C

X

C

ON ON Switch Capacitance.

X

C

IN

I

CC

ON Resistance Match between Any Two Channels, i.e., RON max – R

Control Input Capacitance. This consists of BEx.

Quiescent Power Supply Current. This current represents the leakage current between the VCC and ground pins.

ON

min.

It is measured when all control inputs are at a logic high or low level and the switches are OFF.

⌬I

t

t

PLH

PZH

CC

, t

, t

PHL

PZL

Extra power supply current component for the EN control input when the input is not driven at the supplies.

Data Propagation Delay through the Switch in the ON State. Propagation delay is related to the RC time constant
R

× CL, where CL is the load capacitance.

ON

Bus Enable Times. These are the times taken to cross the VT voltage at the switch output when the switch turns on
in response to the control signal, BEx.

t

PHZ

, t

PLZ

Bus Disable Times. This is the time taken to place the switch in the high impedance OFF state in response to the control
signal. It is measured as the time taken for the output voltage to change by V

from the original quiescent level,

⌬

with reference to the logic level transition at the control input. (Refer to Figure 3 for enable and disable times.)

Max Data Rate Maximum Rate at which Data Can Be Passed through the Switch.

Channel Jitter Peak-to-Peak Value of the Sum of the Deterministic and Random Jitter of the Switch Channel.

REV. 0–4–